Multiple-filament lamp



May 29, 1923. 11,456,568

G. E QUANDT MULT I PLE FILAMENT LAMP Filed June 29 1922 Juan nick;

Patented May 29, 19233.

UNHTEQ STATfi GEORGE E. QUANDT, 0F LOCKPORT, NEW YORK.

MULTIPLE-FILAMENT LAMP.

Application filed June 29, 1922. Serial No. 571,827.

To all whom it may concern:

Be it known that I, GEORGE E. QUANDT, a citizen of the United States, residing at Lockport, in the county of Niagara and State of New York, have invented certain new and useful Improvements in a Multiple- Filament Lamp, of which the following is a s e'cification.

is invention relates to improvements in electric lamps and has for its particular object to provide an electric lamp with a series of independent filaments.

A further object of the invention is to provide and electric lamp with a series of independent filaments and a tension spring contactor adapted to engage one of the 'inde pendent filaments and upon breaking or burning out of same is automatically brought into engagement with another of the independent filaments, thus providing an electric lamp that will outlast the life of three ordinary electric lamps.

A still further object of my invention is to provide an electric lamp of the above indicated character, which is simple in construction and operation, durable, efiicient for the purpose intended and one that can be manufactured and placed on the market at a relatively low cost.

These and like objects of the invention will be better understood as the description proceeds and as is specifically pointed out in the appended claims.

Referring to the accompanying drawing which forms a part of this specification and which clearly illustrates the construction of.

my improved electric lamp,

Figure 1 is a side elevation of an electric lamp constructed in accordance with my invention.

Figure 2 is a similar view taken from a differentside of the electric lamp.

Figure 3 is an enlarged fragmentary plan view of the supporting wire and independent filaments secured thereto, and

Figure 4 is an enlarged fragmentary section of the spring contactor.

Referring to the accompanying drawing in detail, like characters will be used to designate like parts in the different views.

In the drawing, the numeral 1 indicates a vacuum globe, 2 the inner glass stem, 3 the threaded lug into which the inner stem 2 is positionedi and 4 the lead wires running through the inner stem. Heretofore, it has been customary to have the lead wires connected directly to the filaments within the vacuum globe, but in my improved electric lamp one of the lead wires is connected to a filament support 5 which consists of a wire bent on an incline and then bent as at 6 at right angles to the incline support 5. The right angle bend in the support 5 provides arms 7 between which are connected a series of filaments 8, the ends of the filaments bemg connected to the arms 7 in any suitable manner. The arms 7 are connected by the end piece 9 which is arcuate in shape, the purpose of which will be better understood as the description follows. The free end of one of the arms 7 is bent as at 10 to provide means for preventing the filaments from becoming disengaged from said arm, the inchned supporting wire 5 acting as a guide for the opposite arm.

A second lead wire in the glass stem 2 is connected with the filament contactor supporting wire 11. The free end of the support 11 is bent as at 12 to provide means for engagement with a filament contactor 13. One end of the contactor 13 is wound around the portion bent at 12 of the support 11 as indicated by the numeral 14 in order to hold the contactor under tension and keep same into engagement with the filaments 8. The bent portion 12 is provided with a stop or guard 15 that prevents the contactor from having a rotary movement in the vacuum globe.

From the foregoing description of my invention taken in connection with the accompanying drawing, it can be readily seen that when the parts of my improved electric lamp are assembled that the spring 14 will force the contactor into engagement with the first filament connected to the spring arm 7, and the arcuate end 9 permitting unobstructed engagement therewith. If the first filament should become broken or burnt out, the spring 14 will force the contactor into engagement with the series of filaments and so on until the entire set of filaments have been used, thus providing an electric lamp that will have the life of three ordinary lamps.

In view of the foregoing description of my invention taken in connection with the accompanying drawing, it is thought that any further explanation as to the construe tion, operation, and objects of same are unnecessary.

While T have shown. and described the preferred form of my invention, I realize that various minor changes may be resorted to, without departing from the spirit and scope of the invention as claimed, and there'- fore, I do not wish to limit myself to the exact details of construction shown, nor to the combination and arrangements of parts.

What I claim as new and desire to secure by Letters Patent is:

1. In an electric lamp comprising an inner glass stem having lead wires runnin therethrough, a series of independent filaments, means for supporting said filaments,

a spring filament contactor, means for supporting said contactor, and means for forcing said contactor into engagement with said filaments.

2. In an electric lamp comprising an inner glass stem having lead Wires running therethrough, a'series of independent filaments, a supportin Wire having one end connected to one 0 said lead wires, arms formed on the opposite end of said supporting wire for supporting said filaments thereon in spaced relation, a spring filament contactor, a contactor supporting wire connected at one end to one of said lead wires, a spring formed on one end of said filament contactor for engagement with said support g and to hold said contactor into engagement with each of said independent filaments.

In testimony whereof, I have aflixed my signature in the presence of two witnesses.

GEORGE E. QUANDT.

Witnesses:

ESTHER A. QUANDT, Mrs, FRED H. FUERCH. 

